Duplex chucking-lathe.



Patented Dec. 5, I899.

J. A. BECHER, DUPLEX CHUGKING LATHE.

(Application filed Aug. 11, 1899.)

(No Model.)

11V VEN TOR A tlomey THE NORRIS PETERS CO I PHOTO-LITNO" WASHNGTQN, D. CI

wires tarts A'rnr retina JAMES A. BEOIIER, OF MISHAIVAKA, INDIANA.

DUPLEX CHUCKING=LATHE.

SPECIFICATION forming partof Letters Patent No. 638,312, dated December5, 1899.

Application filed August 11, 1899. Serial No. 726,890. (No model.)

To all whom it may concern:

Be it known that 1, JAMES A. BEGHER, of Mishawaka, in the county of St.Joseph and State of Indiana, have invented certain new and usefulImprovements in Duplex Chucking-Lathes; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same. I

My invention relates to an improvement in lathes, the object of the samebeing to provide means for more securely holding the work in place; andit consists in a hollow arbor supported at two or more points throughoutits length and provided with two chucks, the chucks being separated byone of the arbor-supporting bearings.

My invention further consists in certain details of construction andcombinations of parts, as will be more fully hereinafter described, andpointed out in the claim.

In the accompanying drawings, Figure 1 is a View in side elevation,partly in section, of a lathe embodying my invention; and Fig. 2 is aview in end elevation of the same.

A represents the bed of the machine, and B the head thereof. This headcomprises a base a and two bearings b b, in which latter are mounted thesectional hollow arbors O O. The rear section 0 of the hollow arbor ismounted in the bearing 19 and is connected at its flanged front end withthe chuck D, While the section 0 of the arbor is supported in thebearing b and is secured at its rear flanged end to the chuck D andflange c of the section 0 of the arbor by bolts 0 and is connected atits flanged front end to the chuck E by bolts (1. These chucks, whichmay be of any approved form, are thus located on opposite sides of thebearing 19, and the two chucks are located sufficiently far apart tosolidly support and sustain long sleeves or cylinders. With thisconstruction the cylinder or sleeve to be turned or bored is solidlysupported at two widely-separated points, and as the arbor is supportedbetween the chucks and also at a point outside of the rear chuck it willbe seen that there is no possibility of the work slipping after it hasbeen once centered in the arbor.

While I have shown the gearing for actw ating the arbor and thefeed-screw, I do not wish to confine myself to it nor to any par ticularmechanism, as my invention resides solely in the-hollow arbor carrying aplurality of chucks, one of the chucks being located between thearbor-supporting bearings.

It is evident that changes in the form and construction of the arbor andchucks might be resorted to without departing from the spirit and scopeof my invention, and hence would have it understood that I do notconfine myself to the details herein shown and described, but considermyself at liberty to make such changes as fairly fall within the spiritand scope of my invention.

Ilavin g fully described my invention, what I claim as new, and desireto secure by Letters Patent, is

The combination with a head and bearings at the respective ends of saidhead, of a hollow arbor made in two sections, mounted in said bearings,one of said sections having a flange at each end and the other sectionhaving a flange at one end, a chuck disposed between said bearings andbetween the two sections of the arbor, fastening devices passing througha flange of each section of the arbor and through said chuck and anotherchuck secured to the other flange of the-section of the arbor having twoflanges.

In testimony whereof I have signed this specification in the presence oftwo subscrib Witnesses:

JONATHAN W. ZIGLER, GRACE E. MoMIoHAnL'.

